Initial picture shader implementation

This CL adds an SkPictureShader class to support SkPicture-based
patterns.

The implementation renders the picture into an SkBitmap tile and then
delegates to SkBitmapProcShader for the actual operation.

R=bsalomon@google.com, reed@google.com, robertphillips@google.com

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/221923007

git-svn-id: http://skia.googlecode.com/svn/trunk@14085 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 11 insertions, 0 deletions

diff --git a/include/core/SkShader.h b/include/core/SkShader.h
index acff959949..076ecf5460 100644
--- a/include/core/SkShader.h
+++ b/include/core/SkShader.h
@@ -16,6 +16,7 @@
 #include "SkPaint.h"
 
 class SkPath;
+class SkPicture;
 class GrContext;
 class GrEffectRef;
 
@@ -345,6 +346,16 @@ public:
     static SkShader* CreateBitmapShader(const SkBitmap& src,
                                         TileMode tmx, TileMode tmy);
 
+    /** Call this to create a new shader that will draw with the specified picture.
+     *
+     *  @param src  The picture to use inside the shader (if not NULL, its ref count
+     *              is incremented).
+     *  @param tmx  The tiling mode to use when sampling the bitmap in the x-direction.
+     *  @param tmy  The tiling mode to use when sampling the bitmap in the y-direction.
+     *  @return     Returns a new shader object. Note: this function never returns null.
+    */
+    static SkShader* CreatePictureShader(SkPicture* src, TileMode tmx, TileMode tmy);
+
     SK_TO_STRING_VIRT()
     SK_DEFINE_FLATTENABLE_TYPE(SkShader)